Use of the attribute is, however, not restricted to the construction
of source trees. It may also be used to construct a shared tree. In
this case, the RPF Vector TLV contains the IP address of a Rendezvous
Point (RP).

It should say:

Use of the attribute is, however, not restricted to the construction
of source trees. It may also be used to construct a shared tree. In
this case, the RPF Vector TLV contains the IP address of an edge
router on the path to the Rendezvous Point (RP).

Notes:

For a source tree, as per section 3.0, RPF Vector TLV contains the IP address of edge-1 which is to be used to reach the source. Similarly, for shared tree, RPF vector TLV should contain the IP address of the edge router which is to be used to reach RP.